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On 16 Sep 2002, at 19:45, Russ wolfe wrote: > PSI=PSI no matter how big the part. That's certainly true, but the total force on that face goes up with R squared. Since the force is distributed around the edge, which for a circular diaphram grows proportional to R, the force per unit length of edge grows as R. So a diaphram that is twice the diameter sees twice the stress on its most stressed portion, the edge. This is why larger pressure vessels have thicker flanges for the same pressure, as well as thicker walls. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/